Photoreaction of Photo-cross-linkable Methacrylate Polymer Films Comprising 2-Cinnamoyloxyethoxybiphenyl Side Group by Linearly Polarized Ultraviolet Light and Liquid Crystal Alignment on the Resultant Films

2000 ◽  
Vol 12 (6) ◽  
pp. 1549-1555 ◽  
Author(s):  
Nobuhiro Kawatsuki ◽  
Katsuya Matsuyoshi ◽  
Masaki Hayashi ◽  
Hirohumi Takatsuka ◽  
Tohei Yamamoto
Keyword(s):  
Liquid Crystal ◽  
Ultraviolet Light ◽  
Polymer Films ◽  
Side Group ◽  
Liquid Crystal Alignment ◽  
Linearly Polarized ◽  
Crystal Alignment

scholarly journals Effect of Position and Structure of the Terminal Moieties in the Side Group on the Liquid Crystal Alignment Behavior of Polystyrene Derivatives

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2822
Author(s):  
DaEun Yang ◽  
Kyutae Seo ◽  
Hyo Kang
Keyword(s):  
Liquid Crystal ◽  
Surface Energy ◽  
Polymer Films ◽  
Side Group ◽  
Polymer Modification ◽  
Liquid Crystal Alignment ◽  
Tert Butyl ◽  
Tertiary Carbon ◽  
Phenyl Rings ◽  
Crystal Alignment

We synthesized a series of polystyrene derivatives containing various side groups, such as the 4-(tert-butyl)-phenoxymethyl, 3-(tert-butyl)-phenoxymethyl, 2-(tert-butyl)-phenoxymethyl, 4-cumyl-phenoxymethyl, and 4-trityl-phenoxymethyl groups, through a polymer modification reaction to examine the liquid crystal (LC) alignment of these derivatives. In general, the vertical LC alignment on polymer films can be affected by the position and structure of the terminal moiety of the polymer side group. For example, the LC cells fabricated with 4-(tert-butyl)-phenoxymethyl-substituted polystyrene having a tert-butyl moiety as a para-type attachment to the phenoxy groups of the polystyrene derivatives exhibited vertical LC alignment, whereas the LC cells prepared from 3-(tert-butyl)- and 2-(tert-butyl)-phenoxymethyl-substituted polystyrene films exhibited planar LC alignment. In addition, the LC cells fabricated from 4-cumyl- and 4-trityl-phenoxymethyl-substituted polystyrene films with additional phenyl rings in the side groups exhibited planar LC alignment, in contrast to the LC alignment of the (tert-butyl)-phenoxymethyl-substituted polystyrene series. The vertical LC orientation was well correlated with the surface energy of these polymer films. For example, vertical LC orientation, which mainly originates due to the nonpolar tertiary carbon moiety having bulky groups, was observed when the surface energy of the polymer was lower than 36.6 mJ/m2.

Model of liquid crystal alignment by exposure to linearly polarized ultraviolet light

1996 ◽  
Vol 54 (2) ◽  
pp. 1599-1603 ◽  
Author(s):  
J. Chen ◽  
D. L. Johnson ◽  
P. J. Bos ◽  
X. Wang ◽  
J. L. West
Keyword(s):  
Liquid Crystal ◽  
Ultraviolet Light ◽  
Liquid Crystal Alignment ◽  
Linearly Polarized ◽  
Crystal Alignment

Generation of nematic liquid crystal alignment with polyimides exposed to linearly polarized light of long wavelength

1998 ◽  
Vol 84 (1) ◽  
pp. 181-188 ◽  
Author(s):  
Yinghan Wang ◽  
Chunying Xu ◽  
Akihiko Kanazawa ◽  
Takeshi Shiono ◽  
Tomiki Ikeda ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Polarized Light ◽  
Long Wavelength ◽  
Liquid Crystal Alignment ◽  
Linearly Polarized ◽  
Crystal Alignment

Ultraviolet-light Induced Liquid-Crystal Alignment on Polyimide Films

1999 ◽  
Vol 38 (Part 1, No. 10) ◽  
pp. 5996-6004 ◽  
Author(s):  
Shaoqin Gong ◽  
Jerzy Kanicki ◽  
Lan Ma ◽  
John Z. Z. Zhong
Keyword(s):  
Liquid Crystal ◽  
Ultraviolet Light ◽  
Polyimide Films ◽  
Liquid Crystal Alignment ◽  
Crystal Alignment
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